论文标题
中频平方公里阵列的相同步系统接收器模块
Phase synchronisation system receiver module for the Mid-Frequency Square Kilometre Array
论文作者
论文摘要
下一代射电望远镜，例如平方公里阵列（SKA）和下一代非常大的阵列（NGVLA），需要精确的微波频率参考信号，可以通过纤维链接传输到每道菜的纤维链接，以相干地采样天文学信号。这样的望远镜采用相位稳定系统来抑制环境扰动在链路上赋予参考信号的相位噪声；但是，稳定系统受纤维链路上光线的往返时间的带宽限制。每道菜肴上都采用了相锁的接收器模块（RM），以抑制往返带宽外的残留相位噪声。 SKA RM必须提供3.96 GHz输出信号，其中4 MHz的调音范围和不到100 fs的正时抖动。我们提出一个RM体系结构，以满足这两个要求。当参考信号在1 Hz和2.8 GHz之间集成时，RM的分析模型预测了30 fs的输出抖动。拟议的RM考虑了最佳实践电磁兼容性，并满足SKA DISH索引器的尺寸，重量和功率要求。由于NGVLA参考设计还结合了往返相位稳定系统，因此该RM可能适用于将来的NGVLA设计。
Next generation radio telescopes, such as the Square Kilometre Array (SKA) and Next Generation Very Large Array (ngVLA), require precise microwave frequency reference signals to be transmitted over fiber links to each dish to coherently sample astronomical signals. Such telescopes employ phase stabilization systems to suppress the phase noise imparted on the reference signals by environmental perturbations on the links; however, the stabilization systems are bandwidth limited by the round-trip time of light travelling on the fiber links. A phase-locked Receiver Module (RM) is employed on each dish to suppress residual phase noise outside of the round-trip bandwidth. The SKA RM must deliver a 3.96 GHz output signal with 4 MHz of tuning range and less than 100 fs of timing jitter. We present an RM architecture to meet both requirements. Analytical modelling of the RM predicts 30 fs of output jitter when the reference signal is integrated between 1 Hz and 2.8 GHz. The proposed RM was conceived with best practice electromagnetic compatibility in mind, and to meet size, weight and power requirements for the SKA dish indexer. As the ngVLA reference design also incorporates a round-trip phase stabilization system, this RM may be applicable to future ngVLA design.
